Naples Laser & Skin

Molecular Profile

Estradiol (E2)

Chemical formula	`C₁₈H₂₄O₂`
Class	Endogenous steroid hormone (natural, not synthetic)
Molecular weight	≈ 272.4 g/mol
Common esters	Estradiol Valerate Estradiol Cypionate Micronized oral Transdermal patch Transdermal gel
Half-life	Varies by form — hours (oral) to days (injectable esters)
Origin	Produced endogenously via aromatization of testosterone by the enzyme aromatase, primarily in the ovaries, and in smaller amounts in fat, brain, and other tissue in all sexes

HOW IT WORKS

Estradiol circulates through the bloodstream and binds estrogen receptors (ERα and ERβ) found throughout the body — not just reproductive tissue. It governs the menstrual cycle, supports bone density, regulates skin and vascular health, and influences mood, cognition, and fat distribution. Levels fluctuate cyclically in premenopausal women and decline sharply after menopause.

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WHAT TO EXPECT

Endogenous production in ovaries, testes, and adipose tissue
Menopausal hormone replacement therapy (HRT)
Gender-affirming hormone therapy
Combined oral contraceptives

BEFORE YOU START

The most biologically active of the three main estrogens (estradiol, estrone, estriol)
Present in both sexes — in men, it's derived from testosterone and plays a role in bone health, libido, and cognitive function
Available in oral, transdermal, and injectable ester forms, each with distinct absorption profiles